Rename toku_pin_ftnode to toku_pin_ftnode_for_query, since it does

query-specific things like applying ancestors messages and upgrading
PL_READ to PL_WRITE_CHEAP in such a scenario

ft/ft-cachetable-wrappers.cc

@@ -201,7 +201,7 @@ toku_create_new_ftnode (
 // then a PL_WRITE_CHEAP lock is grabbed
 //
 int
-toku_pin_ftnode(
+toku_pin_ftnode_for_query(
     FT_HANDLE brt,
     BLOCKNUM blocknum,
     uint32_t fullhash,

ft/ft-cachetable-wrappers.h

@@ -139,7 +139,7 @@ toku_create_new_ftnode (
     );
 
 int
-toku_pin_ftnode(
+toku_pin_ftnode_for_query(
     FT_HANDLE brt,
     BLOCKNUM blocknum,
     uint32_t fullhash,

ft/ft-ops.cc

@@ -5173,7 +5173,7 @@ ft_search_child(FT_HANDLE brt, FTNODE node, int childnum, ft_search_t *search, F
         );
     bool msgs_applied = false;
     {
-        int rr = toku_pin_ftnode(brt, childblocknum, fullhash,
+        int rr = toku_pin_ftnode_for_query(brt, childblocknum, fullhash,
                                          unlockers,
                                          &next_ancestors, bounds,
                                          &bfe,
@@ -6010,7 +6010,7 @@ toku_ft_keysrange_internal (FT_HANDLE brt, FTNODE node,
         FTNODE childnode;
         bool msgs_applied = false;
         bool child_may_find_right = may_find_right && left_child_number == right_child_number;
-        r = toku_pin_ftnode(
+        r = toku_pin_ftnode_for_query(
             brt,
             childblocknum,
             fullhash,
@@ -6225,7 +6225,7 @@ static int get_key_after_bytes_in_child(FT_HANDLE ft_h, FT ft, FTNODE node, UNLO
     uint32_t fullhash = compute_child_fullhash(ft->cf, node, childnum);
     FTNODE child;
     bool msgs_applied = false;
-    r = toku_pin_ftnode(ft_h, childblocknum, fullhash, unlockers, &next_ancestors, bounds, bfe, false, &child, &msgs_applied);
+    r = toku_pin_ftnode_for_query(ft_h, childblocknum, fullhash, unlockers, &next_ancestors, bounds, bfe, false, &child, &msgs_applied);
     paranoid_invariant(!msgs_applied);
     if (r == TOKUDB_TRY_AGAIN) {
         return r;